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You put it on dc, you can check alternator ripple voltage with ac... but thats for a different day. I would not condemn an alternator just based on voltage. Ive seen them put out voltage, but not amperage... So itd be best to actually load test the alternator with a carbon pile. Then once ya figure out amperage and oltage you should make sure all the wiring for the alternator is ok first,like fuses, and current for the field windings.
ASE Certified Master Automotive/light duty truck Technician
ASE light diesel specialist
Ford Certified Diesel Technician
Isuzu Certified Gas/Diesel Technician
2007 F-250 PSD FX4 crew cab shortbox king ranch
2005 F-250 PSD FX4 crew cab short Box burned up
2013 Fusion 1.6L Ecoboost
2011 Ford Edge
1999 Dodge 2500 Cummins
Last edited by WEWILLE; 09-10-2008 at 04:48 PM.